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The viewer3d: Viewing 3D images with v3dlib PDF Print
Article Index
The viewer3d: Viewing 3D images with v3dlib
The v3dlib library
Change of 3D Cut Position
Moving visible part
Changing Brightness and Contrast
Colour mapping
Overlaying
License, Download, Authors

Each channel of an RGB or RGB16 image is processed individually and mapped to the range [0..255]. These channels are then combined to a resulting RGB value. Individual channels can be selected from the menu Mapping.

Voxel values of greyscale images of all types are first mapped to a value from the range [0..255], which defines an index to a colour pallete. This allows displaying of greyscale images in colours. The possibilities are:

  1. Gray - no pallete is used. Only grey values are shown
  2. Saturation - voxels mapped to 0 are shown in blue colour, voxels mapped to 255 are shown in red colour, and all other values are shown in grey. This enables visualization of under- and over-exposed values. For example this choice together with Percentil stretch shows 5% of the lowest values in blue and 5% of the greatest values in red.
  3. saturation.jpg
  4. Labels - a distinct colour is assigned to each value. It is suitable for displaying of indexed (labelled) images after segmentation.
  5. labels.jpg
  6. Periodic - a pallete with gradual colour and the same colour for 0 and 255. This mode is, for example, good for the visualization of orientations or intensity levels in images.
  7. palette.jpg
  8. Pallete - a user defined pallete can be read from a file.



Written by Petr Matula   
Last Updated ( Tuesday, 03 November 2015 )
 
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